Mining machine



Sept. 21, 1943. R. K. JEFFREY MINING MACHINE Original Filed June 21, 1938 7 Sheets-Sheet 2 f/vvs/w-oe ROBERT KJEFF-REw; BY m W,

HTT'Y Sept. 21, 1943. R K. JEFFREY MINING MACHINE Original Filed June 21, 1938 7 Sheets-Sheet 3 HTT'Y Sept. 21, 1943. R. K. JEFFREY MINING MACHINE 7 Sheets-Sheet 4 Original Filed June 21, 1938 VE/Y TOE I ROBERT K. JEFFEEX y v m I y IJ'rr'Y- HTT'Y.

TSheets-Sheet 5 Sept. 21, 1943. R. K. JEFFREY MINING MACHINE Original Filed June 21, 1938 Sept. 21, 1943. R. K. JEFFREY I MINING MACHINE 6 NN MQN Z 5 mp E m mm m M bbbzbwl Q q .WK w. p N m MT. w 8 Ow mm TPMW Q m m m w F m m m I HTTY Sept. 21, 1943. R. K. JEFFREY MINING MACHINE 7 Sheets-Shee t 7 I Original Filed June 21, 1938 /NvE/v7-o/ Pose-RT KWJEFFREY BY m. KW/4,

Patented Sept. 21, 1943 UNITED" Robert K. Jefirey, Columbus,- dhio, assignor to K The Jefirey Manufacturing Company, a corpo ration of Ohio Original application 214,959. Divided and this application'october n 16, 1940, Serial se-1,405 r w Claims. (01,. 262730); I-his invention relates toa ininingmachine:

adapted to slide over; a mine floor while cutting a kerf and an object: of the invention is to provide improved means for adjusting the'inclination of saidmining machine to determine the pathof travel. of the cutter bar.

Another object of the. invention is to provide an improved hydraulic mechanism for levelling or adjusting the plane of a mining machine to compensate for irregularitiesin -the; mine floor or irregularities in the plane of a coal band or adirt band. e

A further object of the invention is to provide I an improved control valve fora hydraulic sys-- tern which is particularly useful in controlling a mining machine;

Still another objectoi the invention is to provide an improved form of hydraulic pump partic- I ularly adapted for use in a mining machine.

Other objects of the invention will nappear vH -{Ii ofeFigell; looking in the direction of the arrows ;v .2 1 .Fig.-- 13 isya sectional view taken on the line l3-l3 ofFig, 11,- looking in the direction of the. o s: a ,.i:' l rFigQ 14 ,isa; schematic illustration. of the hy v draulic; control system with the control valve. in;

one position of adjustment;

Fig. is i ncomplete ch atic s win or pipin'g diagram-pf the hydraulic; controlsystem withthe ;control valve in ,a difi erent position of adjustment from. that ,illustratedin Fig. 14;

hereinafter, the novel features andcombinations being set forth in the appendedclaims. In the accompanying drawings o p g Fig. 1 is a plan view cfthe mining machine comprising my invention with part, of the cutter bar broken away;

Fig. z-is a side elevational view of theyappa- I ratus of Fig. 1;;

Fig. 3 is an enlarged plan View ofthe forward section of the mining machine comprisingimyil invention with the top cover plateremoved and with parts shown iii-section; A

Fig. 4 is asectional elevationalview taken on the line 4-4 of Figgl', lookin'ginthe direction of the 'ar-rows; q I

' Fig; 5 is a detailed. sectional elevational view taken on the line 5-5. of Fig." direction of the arrows;

F g. 6 is a Sectional elevational viewtake-n on the line li -'6 of Fig; I, looking in"th.e direction of the arrows;

1, looking in the Fig. 7 is va transverse sectional elevational view taken on, the line l,l oi Fig. direction of the arrows;

Fig. 8 is a sectional elevational the control; valve ventiom: I

1, looking in the es a nd elevational viewof the. control valve of mg.- 85:

10 is. a. Fig; 8;

. .50 plan View of the. control valve. of

is an en1ared..plan .view' of thepurnp comprising a fieature' of my invention;

Fig. 12 is a sectional View taken on-rhenne- Figs. 16,,1'7Qandl8 are similar to Fig, 14 showing' three. other positions of control. verv adjustment of the skids connected chine and '1 ,liig, 201, is'an e nlarged view of-thefmeans for to. the bottom of the mining ma idetaohably connecting one end of I each of the:

skids to the bottom of the miningmachineh 'This applicationis' a division of copending applicatiomSerialNo. 214,959, filed Junezl, 19.38, i} for an improvementin a Mininglmachine, now I ;Patent No. 2,278,656, dated Apfil'l, 1942. V

.Z'Iheinvention herein disclosed represents an,

improvement on the invention disclosed and claimedin PatentNo. 2',09 1,4051of R. K. Je'iirey I etiaL, ior alviiningmachine,dated August 131, lesio s Eatent'No. 2,091,41opr E. Mitc'helll fora Mmingfmachine', datedAugust 31],- 1937.

It will ibe' understood that. structural details. not herein disclosed in the fullest detail follow the disclosures of the two above mentioned pat-. 3 fonts.

is formed by a main frame. Zflmade up of thetail section 2:; theinotor'section 22 and the head.

together; and may betaken' apart by. the siniple eiip'edient of removing nuts 24. The tail section 2i; :followsthejstructure disclosed in theabove 1' mentionedfpatents; Ittheref refneeds no par Q ticular-deseription eXceptPfQrfthat hereinafter i view through i conmrisingia feature. of m 'in givenfin-connection with'Fig. 5 of the drawings which does represent one invention.

a mining operation orto' move the mining machinelfrom piace "to piece. The notor section '22:. likewise follows the structure of each of the Fig. l9is aside elevational View of one of the The mining machine comprising my invention ends with oval openings 3| adapted to receive the oval heads 39 which construction permits 1 each of said skids to be pivoted from the dotted to the full line position iIIustrated Fin Fig.-

where it is hingedly or pivotally attached. The forward ends of the skids 29 and 30 are pivotally attached to a pair of piston type hydraulic motors 3| and 32, respectively, which follow in structure the disclosures of each of said above mentioned patents. The structures of. the two motors {I and 32 are similar and in the interest of a com{ plete description mtor"3l' may be'briefiy described as follows. Said motor 3! comprises a removable cylinder 33 tightly received in a cylindrical opening in the mainframe of th head section 23 and provided with a downwardly err tending centrally positioned rod 34 having a head 35,- Figf6'. Within the cylinder 33 is "a'piston' 36 provided with seal r1ngs3 7wl 'i'ch fiiay be clamped tofthe piston 36 in a receiving fgro ove by a threaded clampingmerriber or gland 38fwhiclij;

has threaded relation with t he piston 36. A The a of t dfif'ceqp re .ri i g at th Q tq pit i n v n 9 1 5 5 .4 Q2 the bottom of the clamping member glandfifif to determinethe limits ofmovement of the piston 36. Adjacent itsbottom, .piston36 is provided with a pair of downwardly extendingQarms41,]

4 I (see Fig. 7) adapted to receive a pinAZfto rov e Pivotal onnecti n w tllle u sta n lug 43 on the skid 29. It willthus beevidentthat.

vertical adjustment of the piston35 willprovide' for pivotal movement of the skid' ZB about. its. rear end to adjust the. elevation and (inclination 1 of one side of the. mining machine.

as previously mentioned, the, pis'to'n motor 52 is similarin construction to the piston motorifi'l and thus it maybe operated ...to adjust the skid 30. abou't1its rear. pivotal axis., "It "is. therefore evidentthat by adjusting .the. skids 29 and 35, a individually, both the transverse andlongit'udinaL- slope, of thejjnining, machine may be adjusted the height vof the. mining machinelmaybe -adjusted and as a consequence, .theheightland /or inclination of the kerf cutting mechanism may also be adjusted. .The .improved hydraulic sy stem which I have provided for...operating the motors 3i and 32 is describedini 'detafl hereinafter.

MQunted. upfi the. lower. forward z-po rtion of the head sectionj23 is a-kerf cutting mech'anisrn; comprisinga cutter'bar-M rigidly attached toan adjusting plat e 45, by-welding, which plate 45 IP o Hy mount'enf-upomt e bottomplate 46 of the headsection 23-for adjustment about thevertical axis-cf thel hereinafter. described kerf" cutter chain drive 'shaft. 1

.Tomaintain the-adjusting plate 45- attached to the bottom plate 45 while providing for their adjustment,.lprovide-cooperating ledge -plates 41 and 48 which areQattache d, respectively, to the I plates .45 and.46.. .The adjusting plate 45 is'provided with a plurality of spaced apertures as disclosed in full detail in the above mentioned pattwo above mentioned patents.

of locking pins 49 carried by a projection 50 on the front of the head section 23.

Associated with cutter bar 44 in a well known manner is a kerf cutting chain 5| (Fig. 4) provided with appropriate cutter bits and adapted to be driven by a drive sprocket 52 keyed to a drive shaft 53 which is journaled in the head section 23 by bottom anti-friction roller bearing 54 and top anti-friction roller bearing 55, the latter of'which is carried in a pocket in the removable top plate 56 of the head section 23 and held in place by a removable cover plate 51.

Dri'ving of the shaft 53 is effected from a worm gear" 58 throughj a clutch comprising jaws 59 mounted on said worm gear 58 and shiftable clutchingelement 60 feathered on a cup 5| which isfwelded to the shaft 53 as at 62. A shipper 63 operated by a ybke' 54 which is controlled by a toggle and link mechanism 65 (see Figs. 3 and 6) 'isp'r'ovi'ded to effect engagement and disengagem'entf'of the clutch"to effect 'a" driving or sen} dr ving relation"between'the"worm gear 58 am; the dr ve shaft 53." Anoper'ating rod 66 is provided for the toggle and link mechanism 55"which extends to an operators positionedjacentf-the tail section 2I of the mining rnach"'e "Theconstruction of the toggle andflinkfnechanismfias well as' the clutch, followsth'e' disclosure of the To efiecta seal, thereby'to preventaflo ss'iof oil from the head section 23, rprovmea'grea sealB'l (Fig. 4) between the cup B and the' bottom plate 46 the structure of "which is" also described in full detail in the'labovejineritioned patients.

It may be mentioned'that the head s enes is divided into three compartments "by partitions 68 and 69 '(see Figs.'3, 4 and'lyffor" E and which is adapted to be filled witlrlubrlqating hydraulic ontroljmechariisfm for the piston motors 3| and 32, hereinafter described in full detail; The third of said compartments is a, gear compartment; as hereinafter described in more detail. I 'Itinay be mentioned that the compartments H and 12 are provided with a common removable top plate .73 by which access is gained to the interiorthereof. a e

Mounted within thepartition BBand forming a part thereof is a hydraulic oil pump 14, the structure of which is disclosed in full detail in Figs.

3, 1 1, 12 and 13 of the drawings. Said pump 14 comprises a main frame or casting. 15 provided with a flange. adapted to rest against the partition 68 and provided with a pair of spaced vertical counter-bored holes 11, 7'! adapted to receive .screWsriBisee Fig. 3), to attachthe casting 15 rigidly to the adjacent enlarged portion of the partition 68.

The casting 15 is also provided with a horizontally positioned angularly extending bore 79 which forms the cylinder 'of-tl'ie'pump '14. For

purposes of manufacture; the bore 19 extends completely through the casting15 and through an extending tapered neck portion 80 thereof and one end is thereaded at 8| to receive a nip- ::ple of the check valve 82 (see Fig. 3). The bore 19 communicatesxwith' a chamber 83.intermediate its ends, which chamber 83 is formed by a vertical bore the top portion of which is closed by a threaded plug'84fto prevent the formation of ents. adapted to. receive selectively-0ne of a-p'a'ir .75ian airdrome;

Within the cylindrical. bore: 19 I position a .pis'

ton or plunger d5 providedwith spaced oil grooves.-

86, 86 which extends through; the." neck portion 8% and is provided with a'bearinghead 8L. Sun.

rounding the neck: it!) is aooil spring '38 one end of whiehrbears against. the head 81 and the. other 1 against'a boss'oi the castingll'td tending to-v move the piston $5 outwardly or'to the right; as viewed in 11 andlZ. .li 1

To reciprocate the-pistonfifi, and particularly to'move it againstutheT-actionof thesprineilh;

I provide an eccentriccam 89.1which is rigidly at-.'

tached to'the worm gear 58 by appropriatescrews; ascelarly illustrated in Figs. 3 and lof'the-drawv ing's; It isthus tube; seen that'the worm gear as which. is in the gear train' for driving a Keri-cutting mechantsnifincludiogf the cutter :chain 5i,

is also employed to'drivefthe. hydraulic.' pump. Hi.

cates with a vertically disposed port 82 leading to a chamber 93 Which,".in;:turn, commimicates with outlet passage 94 leading :to an' internally threaded boss195 adapted to receive the pressure line of thehydraulic control system, as hereinafter described in full detail. a A removable'iball check. valveiilfi .is associated with the port-92 and provides for free flow of oil to the passageM irom the passagefiil but prevents a reverse flow thereof. (In other words, thecheck valve 96 controls; the proper outward flow of fluid'from the pump to the out-put or pressure line. It will thus be seen that upon operation of the-cam 89; which operates-Whenever the driving motor is in operation without or non-operating condition, the hydraulic pump 14 will be operated to supply pressure to the hydraulic control; system for-the piston motors 3i and 32, as hereinafter described in full detail. Before describingjn 'detail the control valve. which controls the operation-of the hydraulic piston motors 3! and=32,-'attention is directed particularly to Figs. 3, 4, '7 and-lO-and to the ash-- eral system for controlling'said piston motors 3! and 32V Itis to be noted that (within the comp artment H thereis formed an oil sump 97 (see Fig. '4') in the bottomof .whichis positioned an oil strainer 98 connected by a feedpipe llfi to the previously described check valvedz Fig; 3. This provides for the feeding of oil or other hydraulic medium to the pump N; it being understood that the sump 9'! is maintained full of oil or at least at a level above thestrainez '98 at all times.

Leading from the boss 95 of the pump. isthe pressure linev or pipe II!!! which is connected to said boss 95 by an appropriate threadednipple.

The pressure line Hlilis connected to a blockllli the in' regard to hetherthe 'keri-cutter is in operating (Fig. 3) by an appropriate nipple which block 7 ll is provided with a horizontal through pas-r sage leading to an outlet. pressure pipe m2 which,

in. turn, leads to the pressure boss 183 of the con-- trOl .valve I54 illustrated gin detail in lfigs, 8, 9

' operations:

It; may be statedgenerallv thatlby opera.ti'onpot:-:v the controlvalve Hi4; oiliunderpressureisuppliedai thereto the pump-.l iniay'xhe diverted either to the sumplfl l" or toselected ones oi the piston J motors'3l. or 32'; as hereinafter described? in iull; detail. 31. 1 I i; Also associated with the. blockil'llfi'l; so; and in'fcommunication with the'lvreviously described longitudinal passage thereof. which connects the-. pressure pipes M8 and tQQrisp-anupwardlylexai tending passa e leading to a press'vrerrelieivalve Mil adapted to disohargelxoiluto. thelsunipx 951- whenever. excessive. pressure isz, realized the: pres'sureline. ldflt 1 1 2 hereinafter described in iulllzdetail, th 1 pressureareliei'. valve lzit'fisto: takecare of-an": emergency-condition because in no rn liopera-ir. tion a low pressure by-pass providediol'r the. pump 14 thereby providing iorwits .operationz'at substantially tho-load vexoej .fwhelr it useful work. r1 a i: Before'proce'ednigf with-the description oia the .7 controi valve Hi4; attention is; directed to: the '5 drive for the worm gear. Eli w, ch is illustrated? particularly in; Fig 4 3 and not the-drawings}? A's-clearlyxillustrated in Fig: 3.,"a worm-wits cart-l fried by a" shaitfliid meshes-with the-:worm" gear 5 merit 72 andmeshes withthe drivepini'on Hit; a

on theend. ofxthe armature. shaft HEY-f1- o'f :Ithe electric; motor carried within-motor seotionwzz-i which shaft 1 i2 '1 extends into'compartment' :12... It is thus to be seen that-whenever the feleotr umotorof theminih'g machine is inopera'tidirtlrerel will .be a; driving: connection to the cam 8% which will cause the pumpti'l ll to provide-fluid pressure. 5 for operating the hydraulic iston motors?! l and 32'." Thisiis independentrof thetoperationiof the ke'rficutting mechanism though} of: coursejsthe q hydraulic system may; be operated at :the' same'f l time that the-.ktf-odttihe mechanismist Before proceeding Withothe description.

:valve I04 is also within the compartmentJ-lfand:

bolted -to;thej bottom Plate 46; of section: 23', *as. clearly illustratediinrFi'gs. ,3 and .4 of the draw-ti ings.- It is thus to be, seen-that thecontrol-iivalvei. I04 pressure relief valve 101-; the block i!!!)yahdthe pump: H, i -as' well as all oiizthe connecting:-

pipes or linesyexcept part of the feed'pipe W6 are within the compartment 1 lwherethey, are fully enclosed andprotected; i

As-clearly seen in Figs. 8, 9 and l0 ofthe'draw-, i :ingslthe controlavalve-JM comprises'a mains extending cylindrical bore =l I 7: adapted to reeeive a sliding piston or;-plunger- H8. provided; with; spaced end -oi l seal grooves; l: [9; i l I 9.1"" The "cylini dricalmember I lficarriesa previouslyame'ntioned' pressureboss Ills-which is connectedxto pressure pipe I02 an carries bosseslZlJand I21:(zonnected;

the detailedstructure" of the1contro1 valve 2'04; it is? respectively; to previously mentioned fe'ed. pipes 11 |05 and I 06.' Boss I03 is provided with" a pair of pressure passages I22 and I23 leading to pres sure chambers I24 and I25, respectively, formed in cylindrical member IIG. Boss I'is provided with a, feed passageway I25 leading to feed chamber I21 and 'boss 'I2I is provided with feed pas sa'ge I28 leading to sfeed' chamber I29.

also provided with a vertical bore I30.

'It may be stated thatlthe feed chamber I21;

pressure'chamber I24, bore I30, pressure chamber I25 and feed chamber I29 are spaced progressively from the rear end to the front end of the cylindrical member I I 9' and each is spaced the same distance from the next successive one so that upon giving five equal movements to the piston I I8 a selected point will progressively move from chamber I 21 to chamber I 29 in the sequence above set forth for the purpose hereinafter de scribed in full detail. 1 I

The piston II 8 is provided with alongitudinally extending bore |3| which is closed'by a plug I32 and communicates with a pair of horizontally extending ports I33 and I34, midway between which is a verticallyextending port I43, which ports I33, I43 and I34 are spaced apart equal distances which distances are equal to those between chambers I21 and I24, chamber I24 and bore I30, bore I and chamber I25, and chambers I25 and I29. I

To provide for the'shifting of the piston I I3 longitudinally to control the operation of the hydraulic piston motors 3| and 32, I provide an operating lever I 35 which is pivoted to a pin I36 carried by the arms 5 and provided with an elongated slot I3I adapted to receive a pin I38 which extends through a neck portion I39 of the piston. II 8. A cotter key 1|40' extends through thepin I38 and neck I39 to hold them together.

'To provide for automatic centering'of the piston 8' I provide a pair of similar spring means |4| which are coiled about the pin I35 and have upstanding arms adapted to engage alternately the pm I 38 and stops I42 carried by the arms I I5.

It will be evident that the spring means I 4| urge the piston I I8 to a neutral position in which the 1 ports I33 and I34 are opposite the chambers I24 and. I'25,res'pectively, and that when 'said piston I I8 is movedcineither'direction from this normal the moving force is'removed.

Asclearly illustrated in Fig. 8 of the drawings, there are five operating positionsfor the lever I35 designated N which is the neutral position" (see Fig.116), 3|E which is'thejposition at which hydraulic piston motor3| is elevated- (see'Fig; 15),"32E which is the position at which hydraulic piston motor 32is elevated (seeFig, 17), 3ID

which is the position at which hydraulic piston motor 3| is discharged (see Fig. 14), and 32D which is'. the position at which hydraulic piston motor 32 is discharged (see Fig. 1'8). When the lever is in the neutral or N'position w'ith piston II 8 in the position illustrated in Fig. 16,

put of. oil therefrom W111 flow freely to the sump as to bore I3I from which it willbe discharged Intermediate its ends the cylindrical member IIS'is' plied above the piston of said piston motor 32,

T50 position; it .willibe automatically returnedwhen' I annoyance in Fig..1"1, communication is provided from pressure pipe I02 through boss I03, passage I23, chamber I25, through portl43 which isnow in alignment with 'chamber I25, through bore I3I,

port I34, to chamber I29 from. which it flows through passage|28 in boss |2I to feed pipe I06 connected to hydraulic pistonmotor 32. It is evident that when this oil under pressure is supsaid piston .will' be. moved downwardly thereby to elevate that side of the mining machine by,

virtue of the downward movement of the skid 30 with respect thereto; In said position 32E it may be noted that the port I33 is in the plane of the bore I38 but since they extend at right angles to each other no communication is provided between them and port I33 is effectively sealed.

-By moving the lever I35 to the position 32D with piston. H8 in the" position illustrated in Fig. 18 the oil in the hydraulic piston motor 32 is allowed to discharge under the pressure caused by the weight of the mining machine thereon, the discharge passageway being from feed pipe I06 to chamber I29 by wa'y of. passage I28, through port I43 which is in alignment with chamber I29, through bore |3I and out of port I34 into the sump 91, since port I34 in this position extends beyond the forward extremity of the cylindrical member H6 and is exposed to atmosphere in the compartment 'II.

When the lever I35 is moved to the position 3IE with piston I I8 in the position illustrated in Fig. 15 pressure from the pressure pipe I 02 flows I through boss I03, passage I22, chamber I24, port I43, bore I3I,'port I33; chamber I2'I to feed passage I26 in boss I20, thence by feed pipe I05 to the hydraulic piston motor 3|. This oil under pressure supplied to piston motor 3| will force the piston 38 thereof downwardly relative to the mining machine thus causing elevation of that side of the mining machine through the skid 29.

To discharge the hydraulic fluid from the hy- It may also be mentioned that when the lever I35 is in the position 3 ID or 32D to discharge the fluid from the hydraulic piston motors 3| or 32, respectively, there will be a by-pass for the pump I4 to prevent its operating under load while no useful work is being performed. This is evident from a consideration of Figs. 8and 14 of the drawings in which the control valve I04 is illus- I trated in position 3|D and in which oil under pressure from the pipe I02 is free to flow to the passage I22, chamber I24, port I34, bore I3I and into the compartment 'II by way of port I33. When the lever I35 is in the position 32D illustrated in Fig. 18, the by-pass for the pump l I is provided from the pressure pipe I 02 through passage I 23, chamber I25, port I33 in alignment therewith, bore I3I and out port I34 into chamber 1 I.

It is thus to be seen that the continuously operating pump I4 is provided with a no-load by-pass -not only for the normal or non-operating positioni oisthe :oo'ntrolayalver lli4gitbutralso forlrthe positions thereof in which thehydraulieupiston mot'orsdhandifil are:beingi'discharged. .1

Y It is also 'to -be notedtthatiwhen the lever 135 is in theuneutrl'alwpos'itionz-a noslo ad'lbW-paSSiiiS: not only providedcifor lthe: pumpy'lh, but both ofifthe hydraulic pistonimotorisfs lirand'r3ziiare lockedtzin their; selected positions: 71 This issdueitcrithe fact dihfitiWhEfi' said le'ver. 4 35iis:inithelneutrala'position there-is? noport l335nlfi4ioni=l 43: iri1communication with. thex'chambers: $211 for. 292:; Inoother:Words, under these conditionsithechambers. I21 and I29 are sealed, therebysealing Ithe'oil inthe hydraulic pistoll'motorslfliand flj lmiszzof importanceato -note .that imtherope'rae 1' lifiim'olbto itsfnutial positibnito lock the operated motorrindts. position of adiust-mentlwithoutipassing through a release or discharge positionflfor said zhydrauliopistohimotorl To provide for the control of the lever I35 from a position adjacent the tailsection 2i where the other controls for them'ining machine are assembled, I provide a longitudinally extending rod I44 having a head. I45 which is attached to said rod I44 by a pin I46 (Fig. 3) The head I45 is provided with an elongated slot I47 adapted to receive a pin I48 carried by the pper end of the lever I35 and providing a pivotal sliding connection between the rod I44 and the lever I35. Cotter keys I49 are provided to maintain the pin I 48 in place. The rod I44 extends from the head section 23 through the motor section 22 and to a position at the forward end of the tail section 2|, as clearly illustrated in Fig. l of the drawings.

As best seen by reference to Figs. 1 and of the drawings, the rod I44 is provided with a pair of spaced notches I50 adapted to latch over'an edge I 5! of a housing I52 adjacent the forward end of said tail section 2I The notches I 50 are so positioned as to correspond with positions 3IE and 32E of the lever I35. As a consequence, said notches I55 serve the double purposes of indicating to an operator who is operating the rod I44 that the lever I35 is in the position 3IE or 32E and of latching said lever I35 in either position 3IE or 32E so that continued expansion of a hydraulic piston motor 3I or 32 may be continued without requiring the operator to hold the rod I44 manually in-m0tor expanding position. In

other words, for the operator to expand a hydrau v I lic piston motor 3| or 32 it is only necessary to move the rod I44 forwardly or rearwardly from its neutral position and to latch a notch I50 over the edge IIiI. When this interlocking relation is released the lever I35 will automatically return .I'4-irlsilaccon1inubirsly snpe-ratingslpumpnandi pro rides: fluidilpressure ratzal'l-itinresnduring ithenope eratiorriof said imiito e'idnivd forethe kellfri cufttiiigmechanisnraslselectivelycontrbllable and isridrivennfrom thessamerelectific motor through the gear trahriinclilding he e'ntica'l drive-shaft 53 and the .spto'ckeiifizh I v 1 The. availablexhydrauli'c .liquidlrunderi pressure flOlIlfifbh =I4'. fcan -obe supfili ednatowillrby the: operaton'bmoperatingzthe men-r4: toiexpand 1 commbdateitlreliminin'g anachinetiztoiari'zluneven mine flolm orltmanauneven-rseanr ofi-coahor other material which zisirto"beicutioutzq s I It is: further ievidentirtl'iatrstlierioperatori may discharge). thei rrthetchydraulioz ston motorsrtir and 3zr s'eiectively':b'ysoperatiomofatl'le same rrod 144i ;Itziisothnsimanifest:ithatv a'zvery flexibleifcontrolicfon thenleyellingrinfiother mining maoliineriand cutterrtbar nisiaproyidedzslandnone which requiresmoappreciable: e'fiortio ,skillzgon thapahtstofrth'ezoperator; o3; "i1;:-h,;- 1 c f.

It is furthermore to be noted that the hydraulic system is operative at all times to provide pressure when useful work is to be done, yet when no useful work is being done the-pump of said system operates at substantially no-load.

It is still further to be noted that the hydraulic system is substantially entirely confined to a totally enclosing housing with the mining machine thereby fully protected. In this connection it may particularly be noted that there are no pipes or conduits whatever of the hydraulic control system which are directly exposed or subject to damage, all of said pipes being completely enclosed within the housing of the head section 23.

Lubricant maybe introducedinto the bore or cylinder I9 through the passageways I53, I54,

shown indotted lines in Fig. 11. Such passageways may be produced by means of intersecting bores in the pump block I5. It is preferred to introduce the lubricant from the sump compartment II to the space surrounding the reduced portion of the plunger 85 because it is desirable to have a relatively heavy lubricant in the gear compartment I0 and therefore the sump compartment 'II should always be kept effectually separated from the gear compartment I0.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined'by the claims hereto appended, and Itherefore wish not to be restricted to the precise construction herein dis closed.

Having thus described and shown an embodiment of my invention, what I desireto se cure by Letters Patent of the United States is:

'1. In apparatus of the class, described, .the combination with an, enclosing casing, of a vertical partition therein to afford two compart merits, a sump in one of said compartments, a pump housing carried by said partition and hav ing a pump cylinder, a piston in said cylinder, means for reciprocating said piston, a suction pipe extending from said sump to said cylinder, a supply pipe extending fromsaid cylinder, check valve mechanism for controlling the flow from the sump through the suction pipe and cylinder to said supply pipe,f and 'valve control means for the output'of said pump located in said one compartment and above said sump. 2. In apparatus of the iclass described, the combination with a supporting frame having a drive compartment and asumphcompartment, the sump compartment having a bottom section elevated relative to the bottom ofthe sump to form a supporting ledge, a partition separating said compartments,:arpump supported by the partition, valve mechanism secured to the ledge support, a by-pass relief zvalve carried by the ledgesupport to occupy a position above .the sump and within v:the sump compartment, suction and supply circuits and connections incthe sump compartment, and means in the drive compartment for operating the pump.

3. In a mining machine, the combination with a frame having an enclosing section, of removable cover means for said section, a vertical partition dividing said section into two compartments, power driven gearing in one of said compartments, and a pump having a housing forming part' of said partition and having a piston operated by said power driven gearing, said pump connected to said pumpin the partments.

saidcompartmentsland a pumplhavinga housing forming .part of said partition 'andhaving.a piston operated by said power driven. gearing, said pump havingia feed line leading to a sump in? said other compartment.:. 1

5. In a mining machine; the combination with a frame having a head section; of a partition dividing. said head section intoatwo' compartments, a motor on? said iframe,' kerf cutting mechanism on said flamemechanism including drivegearing inone of said compartments for interconnecting said motor and kerf cutting mechanism, hydraulic mechanism on said frame, a hydraulic .pump including a housing forming a part'of said partition and having a piston 'extending :into said housing, means interconnecting saidpiston and drive gearing to reciprocate the former, and feed and; discharge conduits other of said com- ROBERT K. JEFFREY. 

